Connected: An Internet Encyclopedia
RFC 1122 - 4.2.2.11 Recovery from Old Duplicate SYN: RFC-793 Section 3.4,

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### 4.2.2.11 Recovery from Old Duplicate SYN: RFC-793 Section 3.4, page 33

Note that a TCP implementation MUST keep track of whether a connection has reached SYN_RCVD state as the result of a passive OPEN or an active OPEN.

Next: 4.2.2.12 RST Segment: RFC-793 Section 3.4

Connected: An Internet Encyclopedia
RFC 1122 - 4.2.2.11 Recovery from Old Duplicate SYN: RFC-793 Section 3.4,